Pipe-threading machine



PIPE THREADING MACHINE Filed N 25. L921 12 Sheets-Sheet wmmllmll mulllllllIllillllill"Ml|llllllllllllllliilllllll Mull] 1 ml mm ,4 I Q i i71 E if E v y g 1, v 1 M Wmgumw unnu- INVENTOR Jomv Jmmwoa/mc/ ATTORNEY VI J. 5. lMLACH inns 'rnamnme MACHINE I i e o 25. 1921 12 sheets-SheaINVEINTOR MVJIZ'VDKZGVMACH ATTORNEY July 15 1924. 1,501,218

J. 5. IMLACH PIPE THREADING momma r Filed New 25. 1921 12 sheets-sheet aINVENTOR tlamvmmzvmal.

ATTORNEY OJuly y 1,501,218 J. IMLACH [PIPE THREADING momma 8 F m 25 192112 Sheets-Sheet 4 immmmlmum mmmnmmmlll H wmmli 1 ATTORNEY July 15, 1924.1,501,218

J. S. IMLACH PIPE THREADING MACHINE Fil d 25 1921 12 Sheets-Sheet 5ATTORNEY July 15 1924. 1,501,218

J. S. IMLACH PIPE THREADING MACHINE I' f 8 B w P I .EE: 1 m N II I 3 .IM (I I:

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J. 5. IMLACH PIPE THREADING MACHINE FlledNov. 25. 1921 12 Sheets-Sheet 8g g I.

INVENTOR umv Wham,

' A'h'ORNEY July 15, 1924. 150L218 J. s. IMLACH PIPE THREADING MACHINEFiled Nov. 25 1921 12 Sheets-Sheet 9 l'wii l mvemon I71 (lo/11vJmwz'zvsaivhucu.

ATTORNEY July 15 1924. 1,501,218

J. 5. lMLACH PI PE THREADI NG MACHI NE Filed Nov. 25, 1921 12Sheets-Sheet 10 (ATTORNEY J. s. IMLACH PIPE THREADING MACHINE Filed Nov.25, 1921 12 Sheets-Sheet ll :EI El]- INVENTOR Jonw Jrzmvsazvhucu.

A'TTORNEY 1,501,218 J. S. IMLACH PIPE THREADING MACHINE iled N 25, 192112 Sheets-Sheet 12 mvamon wrwo vmca ATTORNEY Til Patented July 15, 1924.

JOHN STEVENSON IMLACH, OF OTTAWA, ONTARIO, CANADA.

PIPE-THREADI N G MACHINE.

Application filed November 25, 1921.

T 0 all whom it may concern.

Be it known that I, JOHN STEVENSON IMLAGII, a citizen of the Dominion ofCanada, residing at Ottawa, in the county of Carleton and Province ofOntario, Canada, have invented certain new and useful Improvements inPipe-Threading Machines, of which the following is a specification.

The present invention comprehends the provision of a pipe threadingmachine and it is within the province of the disclosure to provide amachine of the character descri ed, embodying a circular milling cutterrotated and transversed by suitable means at proper ratio to produce athread of the required lead.

Among other objects invention residing in the disclosure, are to provideindicators for the various speeds of the machine. said indicatorsgraduated according to the nominal sizes of pipe for which the machineis adapted; to provide a circular milling cutter, the int'eed of whichis controlled by a cam acting on a toggle connection to a false slide,the head carrying the said circular milling cutter to be con nected byadjustable means to the said false slide to accommodate for varioussized pipe; to provide an indicator graduated according to the nominalsizes of pipe for the relative position of the circular milling cuttercarrying head and false slide; to incorporate in a machine of thecharacter described with the said indicator, a compensating dialgraduated from the zero point and on both sides thereof so thatadjustments may be made to compensate for variations in the sizes of thecircular milling cutters used; to provide an indicator for the positionof the cutting off tool, said indicator being graduated in accordancewith the nominal sizes of pipe; to provide a burring tool for theremoval of the burr from the inside of the pipe, said burr being causedby the cutting off tool in the cutting off operation; to incorporate ina machine of the character described, high and low ratio gearingintroduced intermediate the point of the application of power and thespindle of the machine, either of which may be thrown in by a clutch tooperate the machine atcutting off or threading speeds; to incorporatemore than one cutter and necessary associated mechanism with a machinehaving but one spindle or pipe carrying means.

and aims of this Serial No. 517,635.

Many other objects will be readily perceived by a perusal of thedisclosed matter, the invention residing in the novel features ofconstruction and unique association of parts fully described andclaimed, the descriptive matter being supplemented by the accompanyingdrawings, wherein:

Figure l is a side elevation of a machine constructed in accordance withmy present invention.

Figure 2 is a top plan view of the machine as shown in Figure 1.

Figure 3 is an end elevation of the machine as shown in Figure 1.

Figure 4: is a side elevation of a duplex machine constructed inaccordance with mv present invention.

Figure 5 is a top plan View of the machine as shown in Figure 4.

grammatically.

Figure 7 shows a longitudinal section of the opposite side of the gearbox.

Figure 8 is a transverse vertical section as it would appear when takenon line 8-8 Figure 6 of the complete gear box mechanism.

Figure 9 is a transverse vertical section of the gear box as it wouldappear when taken on line 9-9 of Figure 6 of the complete gear boxmechanism.

ing mechanism.

Figure 11 is a longitudinal section taken on line ll-l1 of Figure 10.

Figure 12 is a transverse vertical section taken on line 12-12 of Figure10.

Figure 13 is a port ional bottom plan view of Figure 10.

Figure 14 is an elevation of mounted on the side of the venting motionof the cam shaft when high ratio spindle gearing is in motion.

Figure 15 is a longitudinal sectional ele vation taken on line 15-15 ofFigure 14.

Figure 16 is a transverse'vertical section taken on line 16-46 of Figure14.

Figure 17 is a similar view taken on line l7-17 of Figure 14:.

Figure 18 is a fragmentary plan view of the stop mechanism forpreventing actuathe mechanism gear box for pre tion of the yoke employedfor shifting the lead gears mounted on the cam shaft.

Figure 19 is a fragmentary sectional elevation illustrating the circularmilling cutter head, false slide and the indicating mechanism working inconjunction therewith.

Figure 20 is a horizontal sectional elevation as it would appear whentaken on line 20--20 of Figure 19.

Figure 21 is an end cular milling cutter dial.

Figure 22 is a sectional elevation illustrating the false slide whichworks in conjunction with the circular milling cutter head and theinfeed cam and toggle mechanism.

Figure 23 shows in longitudinal section, the false slide and cutter headcarriage with parts remaining in elevation.

Figure 24 is a fragmentary bottom plan view of the cutter elevation ofthe cirhead compensating head carriage illustrating more clearly theinfeed and circular milling cutter head lead cams.

Referring to the drawings in detail. like characters of referencedesignate corresponding parts throughout the various drawings.

Referring now particularly to Figures 1, 2 and 3, the numeral 25indicates the bed of the machine. The numeral 26 designates a spindlejournalled in the bearings 27 and 28 and having mounted on the outertermi nals thereof, chucks 29 and 30 of conventional construction. Thenumeral 31 indicates the gear box cover. milling cutter head and 38 thecutting off tool head. The numeral 34 indicates the gear box on whichthe cover 31 is mounted.

Referring now particularly to Figures 6. 7, 8 and 9 which illustrate thegear box. the same will be preferably cast having bearings at the endsthereof. Journalled in the bearings 35 and 36 is the drive shaft 37. Thenumeral 38 indicates the intermediate feed shaft which is journalled inthe bearings 39 and 4-0. The numeral 41 indicates the clutch shaftjournalled in the hearings 42 and 43. 44 indicates the cluster gearshaft journalled in the bearings 45 and 46. The numeral 47 indicates thejack shaft journalled in the bearings 48 and 49, the hearing 49 beingintegral with. the bearing 39 for the intermediate feed shaft 38. Thespindle drive shaft indicated by the numeral 50 is journalled in thebearings 51 and 53 indicates the sleeve journalled in been ings 54 and55 and having the intermediate cam shaft drive shaft 56 partiallyenclosed in the same. The numeral 57 indicates the cam shaft which isjournalled in the bean ings 58 and 59.

Referring now to the drive shaft 37. pulley 60 is mounted on oneterminal thereof. This drive shaft 37 will be driven by a 32 thecircular.

belt trained over the said pulley 60, which belt will be driven by asuitable source of motive power, such as an electric motor.Substantially mounted on the drive shaft 37 is the driving worm 61 anddriving pinion 62.

Referring now to the intermediate feed shaft 38, the numeral 63indicates the driving worm which is substantially mounted thereon andthe numeral 6-1 indicates the worm wheel. The numeral 65 indicates theworm wheel which is mounted on the sleeve 66 which fits over the clutchshaft -11. This worm wheel 65 is driven by the driving worm 63. Thenumeral 67 indicates the double clutch mounted on the sleeve 66. 68indicates the drive gear mounted on the sleeve 66 while the numerals 69and 70 designate the first and second speed gears respectively. whichare keyed to the shaft 41.

Referring now to the cluster gear shaft 44. the numeral 71 indicates thefirst speed gear and the numeral 72 the second speed gear. The numeral73 indicates the first speed gear, 74 the second speed 75 the thirdspeed gear. The gears 73, 74: and 75 are slidably mounted on the shaft44 and are provided with key seats for engagement with the key 76. Thenumerals 77 and 7 8 indicate the shift gear collars for restricting themovement of the gears on the cluster gear shaft 44.

Referring now to the jack shaft 47, the numeral 79 designates the firstdriven gear.

80 the third driven gear and 81 the second driven gear. The numeral 82indicates the first jack shaft driving gear and 83 the second jack shaftdriving gear. The jack shaft driving gears 82 and 83 are slidablymounted on the jack shaft 47 and are provided with key seats forengagement with the key 84. The numeral 85 indicates a gear collarsubstantially mounted on the jack shaft 47 which is functioned torestrict the movement of the jack shaft driving gears 82 and 83.Referring now particularly to the spindle drive shaft 50, the numeral 86indicates the first driven gear and 87 the second driven gear. Thenumeral 88 indicates the spindle drive pinion, while the numeral 89indicates the cam shaft drive pinion which meshes with the cam drivegear 90 mounted on the sleeve 91 which is substantially secured to theintermediate cam shaft drive shaft 56. The numerals 92 and 93 designatelead pinions. while the numerals 94 and 95 indicate lead gears slidablymounted on the cam drive shaft 57 and provided with key seats forengagement with the key 96. The numeral 97 indicates a flange integralwith the hub 180 of the lead gears 94 and 95.

Referring now particularly to Figure 2. the spindle drive pinion 88illustrated in dotted lines. drives the spindle gear 98 also illustratedin dotted lines. This spindle gear and gear 98 is circumposed about andsubstantial with the spindle 26.

Referring now to Figures 2, 6 and 7, the numeral 99 indicates a drivepulley which is mounted on the shaft 37 at the opposite end to the drivepulley 60. The function of this drive pulley {)9 will be hereinafterexplained.

The numeral 101 indicates an intermediate shaft coupling the drive shaft37 and the shaft 105 journalled in the cutter head carriage.

Referring now particularly to Figure 20, the shaft 105, journalled inthe cutter head, is provided with ball races 106 and 107 to facilitatethe rotation of the same. This shaft is capable of reciprocating motionto compensate for the advancing and Withdrawing of the cutter headcarriage. The numeral 108 indicates the drive pinion which is formed onthe drive shaft 105. This drive pinion 108 drives the intermediate gear109 mounted on the intermediate gear shaft 110 suitably journalled inthe cutter head. The intermediate gear 109 drives the intermediate gear11] mounted on the sleeve 112 having a pinion 113 formed on the same.Sleeve 112 is mounted on the compound drive shaft 114 which is suitablyjournalled in the cutter head. The pinion 113 drives the spindle gear115, which is mounted on the spindle 116 in a suitable manner. On oneterminal of the spindle 116 is mounted the circular milling cutter 117which is secured in position by means of the nut 118. The plates 119 and120 are positioned over the terminals of the shafts and spindle. Fromthe foregoing, it will be readily perceived that the power transmittedfrom the main drive shaft 37 through the gearing as set forth, willdrive the circular milling cutter for performing its operation.

The cam shaft 57 extends through one end of the gear box 34 as clearlyillustrated in Figure 2. Referring now particularly to Figures 22, 23and 24, the cam shaft 57 has engagement with the cutter head carriage121 by passing through the bearings 122 and terminating in the adjustinghand wheel sleeve 123 which is substantially secured to the said camshaft. The function of this adjusting hand wheel will be furtherexplained hereinafter.

Mounted on the cam shaft 57 is the lead cam 124 which is provided withan annular groove 125 for engagement with the cam roll 126. The numeral127 indicates the infeed cam, the configuration of which is more clearlyillustrated in Figure 22. The numeral 128 indicates the cutter head orfalse slide, as it will be hereafter termed. The false slide 128 isdovetailed into the cutter head carriage as at 129 and the cutter headcarriage is provided with a gib 130 to facilitate adjustment whennecessary. The false slide 128 is provided with the dovetail slide 131for engagement with the cutter head carriage 32. This dove-tail slide isalso provided with a gib designated by the numeral 132. The infced cam127 acts upon a toggle constituting the links 133 and 13+. Link 133 ispivotally connected on one ter minal by the slide link pin 135, whilethe link 134 is pivotally connected at its oppo site terminal to thefulcrum pin 136. The numeral 137 indicates a cam roll pin which connectsthe inner terminals of the links 133 and 134. Disposed intermediate thejaws of the link 134 is cam roll 138 which is rotatably mounted on thecam roll pin 137 and bears against the periphery of the infeed cam 127.From the foregoing, it will be apparent that the link pin 135 engagesthe toggle and the fulcrum pin 136 with the carriage 121. In operation,the cam roll 138 has contiguous engagement with the periphery of theinfeed cam 127. This contiguous cugagement spring 139, one terminal ofwhich is connected to the cam roll pin 137 and the cross feed springbolt 140. clearly shown .in Figure 24. The cutter head carriage ismounted on the false slide 128. The false slide. 128 is provided with anintegral bracket lll which is provided with a head 142 and an aperturetherein designated by the numeral 143. Passing through the aperture 143is a worm shaft 144 shown in Figure 19. which has engagement with thebushing 145 rigid with the cutter head carriage 32. On the outerterminal of this worm shaft 144 is mounted indicator mechanism as willbe hereafter fully described.

Referring again to the gear box mechanism, the numeral 31 indicates thecover for the same. Mounted on this cover is the mechanism for shiftingthe gears into proper ratio for threading and cutting off speeds. I willfirst explain the action of the two-way clutch and its controllingmechanism, which constitutes a rectangular bar indicated by the numeral146 which is slidably mounted in the brackets M7 and 148. Mounted onthis rectangular bar is a yoke 149, the function of which will behereinafter explained. This rectangular bar 146 is shifted by means ofthe lever arm shown in Figure 2 and indicated by the numeral 150. Leverarm 150 is mounted on the upper terminal of the vertical rod '15]. whichhas substantially secured thereto, a crank 152, the bifurcated terminalof which straddles the pin 153 which is mounted on the rectangular bar146.

Referring now particularly to Figure 10, which shows the indicatingmechanism. the indicator point 154 integral with the lever arm 150 isturned so that the same coinwith the false slide 128 is brought about bythe coil cides with the graduation A. In this position. the clutch 67 isdisengaged and the clutch shaft 41 is motionless. If it is desired tooperate the machine at threading speed, the lever arm 150 is turned sothat the indicating point 154 coincides with B. This will operate themachine in the proper speed for performing the threading operation. Ifit is now desired to shift the mechanism into cutting off speed, thelever arm 150 is moved in acontrary manner so that the indicator point154 coincides with the graduation In this position, the clutch operatesthe mechanism for the cutting off speed. Referring again to Figures 10,11, 12 and 13, on the top of the cover are mounted the gear shift leverarms 155, 156

and 157. On one terminal, the gear shift lever arm 155 is connected tothe vertical pin 158 which extends through the cover 31 and has a crank159 mounted on the lower terminal thereof. The bifurcated terminal ofthis crank straddles the pin 160 mounted on the gear shift yoke 161which is slidably mounted on the longitudinal guide bar 162. The gearshift lever arm 156 is connected on one terminal to the pivot pin 163which has a crank 164 mounted on the lower terminal thereof, congruentto the, crank 159. The bifurcated terminal of this crank straddles thepin 165 mounted on the gear shift yoke 166 which is also slidablvmounted on the longitudinal guide bar 162. D I

Referring now to the gear sh ft lever arm 157. one terminal of the sameis connecte to the rod 167 which is of considerable length in relationto the pivot pins 158 and 163. Mounted on the lower terminal of this rodis the crank 168 which straddles the pin 169 mounted on the gear shiftyoke 170 which is slidably mounted on the longitudinal guide bar 171.The opposite terminals of these gear shift lever arms 155, 156 and 157slide in the recesses or guide channels 172 and 173. These gear shiftlever arms are provided with suitable terminals for engagement with theapertures.

174 to prevent movement of the samewhen in the proper position. Theconstruction o the heads ot these gear shift lever'arms is conventionaland need not be explained in detail. These gear shift lever arms may beprovided with locking. mechan sm, but in consideration of theconstruction of the same being in common use, it is thought unnecessaryto give a detailed explanation of the same.

Referring now to Figures 6 and 7, 8 and 9. the gear shift yoke 161straddles the first and second speed gears designated by the numerals 71and 72 which are mounted on the cluster gear shaft 44. Yoke 166straddles the first, second and third speed gears designated by thenumerals 73, 74

and also mounted on the cluster gear shaft 44. Yoke 170 straddles thefirst and second driving gears designated by the numerals 82 and 83mounted on the jack shaft 47. In operation, the first and second speedgears 71 and 72 are driven by the first and second speed gears 69 and70. The first, second and third speed gears 73, 74 and 75 drive thefirst, second and third driven gears 79, and 81. The first and seconddriving gears 82 and 83 mounted on the jack shaft 47 drive the first andsecond driven gears 86 and 87 mounted on the spindle drive shaft 50.

In the accompanying drawings, I have illustrated the gears set forthreading a three inch pipe. W'hen it is desired to thread a pipe ofthis size. the lever arm 150 is turned so that the indicator designatedby the numeral 154 coincides with the graduation B. Power is transmittedfrom the drive shaft 37 through the driving worm 61 to the intermediatefeed shaft 38 hv means of the Worm wheel 64. The driving worm 63 drivesthe worm wheel 65 and power is transmitted through this medium to theclutch shaft 41. The first speed gear 76 now drives the second speedgear 71, thus rotating the cluster gear shaft 44 at the proper speeed.The third speed gear designated by the numeral 75 drives the firstdriven gear designated by the numeral 79 on the jack shaft 47. The firstdriving gear 82 drives the first driven gear 86. The cam drive pinion S9drives the cam drive gear 90, which is mounted on the intermediate camshaft drive shaft 56. The lead gears 94 and are now shifted so that thelead gear 95 meshes with the lead pinion 93. This drives the cam shaftat the proper ratio for the driving of the circular milling cutterdesignated by the numeral 117, see Figure L0. The shifting of the leadgears 94 and 95 will be explained hereafter.

\Vhen it is desired to cut the pipe, the indicator 154 integral with thelever arm 150 coincides with the graduation C. Power is then transmittedfrom the drive shaft 37 through the drive pinion 62 and the drive gear68. The gearing in this manner drives the spindle at a high speedrequired for the cutting operation. It will be appreciated that thegearing hereinbefore described, is constructed to operate the machine atvarious speeds for performing operations on various nominal sized pipes.It is thought, however, that a detailed description for each gear shaftis unnecessary as the mode of operation is similar to the onehereinbefore described.

Referring to the lead shift gears 94 and 95, the same are illustrated inneutral position. \Vhen it is desired to shift the same to operate thecam shaft 57, the yoke 175 mounted on the slide bar 176 is operated bythe shoulder 189 formed on the cam shaft 57 is actuated.

by the crank 177 which is in turn operated by the shaft 178 extendingthrough the body of the machine and actuated by the vertical lever armindicated by the numeral 179. This yoke 175 straddles the lead gears 9eand 95 and moves the same to the right or the left in accordance withthe movement of the lever arm 179. These lead gears 94 and 95 aremounted on the hub 180 which is provided with the integral flange 97 onthe outer terminal thereof, which flange is provided with a slot 181 toclear the control trip 182 shown in Figure 14 when the gears are throwninto operating position. hen the same start to revolve, the slot in thegear hub indicated by the numeral 181 is carried past the control triptrip bears on the side of the flange and holds the gears in mesh untilsuch time as this slot in the flange is again opposite the control trip,at which point the gears return to neutral position, having completedone revolution. The return of these gears to the neutral position isobtained by the coil springs 183 and 184 bearing against the washers 185and 186, which bear against the extended bifurcated terminal 187 of thecrank 177 and are free to move on the release guide 188, but limited intheir travel guide, Which shoulder is straddled by the bifurratedterminal 187 of the crank 177. The vertical shaft ll'ilextending fromthe clutch operating shaft carries at its lower terminal a collar 190which collar is provided with a segmental recess 191 to clear the pin192. This pin is bevelled on its inner terminal as at 193, shown indotted lines to enter the shallow aperture 194 in the shift bar 176.This pin 192 is held in position by the coil spring 195. Then the clutchis in neutral position or slow speed, the segmental recess 191 formed inthe collar 190. is opposite the outer terminal of the pin so that theyoke 175 mounted on the shift bar 176 may be moved end ways to shift thegears. When the clutch is in high speed, the segmental recess 191 is notin line with the pin 192 so that this pin cannot move end ways and comeout of engagement with the aperture 194 formed in the shift bar 176 andthus locks this yoke in a neutral position. lVhen either the lead gear94 or the lead gear 95 is engaged the pin 192 projccts into thesegmental recess 191 which is of such length as will permit the clutchlever 150 to be shifted freely between neutral and slow speed positions,but if it is attempted to engage the clutch in high speed position theend of the segmental recess 191 strikes the pin 192 and prevents motionof the clut h shifted in this direction. When either of the lead gearsis in mesh with either of the lead gear pinions, the The actuation of182 so that the. T

this cam shaft causes the lead and advance cams 127 and 121 respectivelyto operate, thus causing the infecd and advance of the circular millingcutter 117.

Referring again to Figures 2, 3 and 4, the numeral 32 indicates thecutter head having mounted thereon a cutter 196. The numeral 197indicates a burring tool mounted on the arm 198 slidably mounted in andsupported by the cutter head 32. The infeed of the cutter is controlledby the hand wheel 199. The numeral 200'indicates the indicator for therelative position of the cutter head carriage, which advances orwithdraws the carriage to compensate for variations in the nominal sizesof pipe. he construction of this cutter head carriage, cutting andburring tool mechanism is of conventional construction and, therefore,it is thought unnecessary to give a detailed explanation of the same.

Referring now to the lul'iricati'ng means, the numeral 201 indicates theforce feed pump driven by the belt 202 trained over the drive pulley 99and The lubricant is contained in a suitable reservoir in the base ofthe machine and the same is conducted through the main lead pipe 204 andthe sublead pipes 205 and 206 to lubricate the circular milling cutterand the cutting off and burring tools.

In operation, the pipe to be milled, cut or burred is positioned in thespindle 26 and secured in the chucks 29 and 30. If the pipe to bemilled, cut or burred is seven inches in diameter, the gear shift leverarms 156, 157 and 158 are shifted to coincide -with the graduations onthe gear box indicating that nominal sized pipe.

The cutting off operation is first performed. The controlling lever arm150 is turned until the indicator 154 coincides with the graduation (l,resulting in power being transmitted through the high ratio gearing ashereinbefore described, to perform the cutting operation. In this case,pinion 62 drives the gear 68 and the gears and 71, and 79, 83 and 87will be in mesh. The indicator 200 is then adjusted for seven inch pipeand the cutting operation is performed by advancing the cutter headcarriage 32 through the medium of the hand wheel 199. After the cuttingoporation. the burr is removed from the inner end of the pipe caused bythe cutting operation. This burr is removed by the burrin tool 197mounted on the adjustable holder 198.

After the burring operation, the indicatin dial 207 is turned until thegraduation for the seven inch pipe coincides with the terminal of theindicator 208. This operation seats the cutter head carriage to performits operation on a pipe of that size. The controlling lever arm 150 thenturned the pulley 203.

until the indicator 154 coincides with the graduation B, resulting inpower being transmitted through the low ratio gearing as hereinbeforedescribed. The lead gears 94 and 95 are then thrown in, the lead gear 95being driven by the pinion 93. Simultaneously as these gears are thrownin, the cam shaft 5'? is caused to rotate and the lead cam 1% followsthe stationary cam roll 126, advancing the cutter head carriage andcynchronically, the infeed cam 127, acting oil the cam roll 138 of thetoggle connection, causes the infeed of the cutter head carriage throughthe medium of the false slide connection. When the lead gear 195 isthrown into mesh, the cam roll 138 will be positioned on that undulatedportion of the cam indicated'by the numeral 209. The gradual infeed ofthe cutter is accelerated to its full cutting depth by the curvature ofthe periphery of the cam and when the same has reached a certain point,the cam roll 186 follows the concentric face of the cam until the fullthread is cut. The cam roll 138 then meets with the undulation 209 andthe spring 139, acting on the toggle connection, causes the false slideto withdraw. Upon the completion of the milling operation, the slot 181coincides with the controlling trip 182 and the coil spring 188 throwsthe gears out of mesh. It will be perceived that this completes theoperation on the pipe.

After the circular milling cutter 117 is used for a period of time, thesame be comes dull and it is required to grind the same. diameter andtherefore, it is necessary to adjust the cutter head carriage tocompensate for this variation. If the diameter of the circular millingcutter has been reduced, say .0005 of an inch, the dial 210 illustratedin Figures 1.9 and 21 is turned so that the zero point on the verticalface of the indicator 207 coincides with that respective number ofgraduations indicated thereon. This operation will advance the cutterhead carriage 32 to compensate for this variation in the diameter of thecutter.

It is often found necessary to rethread threaded pipes and therefore, itis necessary to adjust the cutter head carriage so that the teeth on thecircular milling cutter will properly coincide with the threads on thepipe to be rethreaded. So that the cutter head carriage may be readilyadjusted, I have threadedly engaged the ad justable handle wheel sleeve123 with the cutter head carriage as at 211. It will be readilyperceived that by turning this adjustable hand Wheel sleeve. the cutterhead carriage will be advanced :or withdrawn so that the, teeth on thecircular milling cutter will properly coincide with the This grindingoperation reduces the threads on the pipe to be rethreaded. Theadjustable hand wheel sleeve is held in adjusted position by means ofthe bolt 212 passing through the collar 213.

In Figures 1 and 5, I have illustrated a duplex machine embodying butone rotary spindle and pipe holding means. The gear box mechanism isinbefore described. On both terminals of the machine, I have providedthreading, cut off and burring mechanism which will operate in acongruent manner to that of the previously described machine. Thismachine is especially adapted for pipes of considerable weight andlength as it will be readily understood that it is unnecessary to removethe pipe from the machine and turn the same end to end, as the same maybe carried through the spindle of the machine and the threading; cuttingoff and burring operations performed on the oppo' site end thereof.

From the foregoing description, it is thought that the advantages,construction and operation of my invention will be readily apparent andwhile I have illustrated similar to that hereand described the preferredconstruction of my invention, I desire to have it understood that thedeviations from such details in the adaptation of the machine forcommercial purposes may be resorted to as do not form a departure fromthe spirit of the invention as defined by the appended claims.

\Vhat I claim as new is:

1. A pipe threading machine consisting of a frame, a pipe holdingspindle supported and rotatably geared in said frame, a headreciprocally supported on said frame, a circular milling cutterrotatably mounted on said head, a cutting off tool frame mounted formovement longitudinally and transversely of said first-named frame, anda means of rotating said pipe holding spindle and said circular millingcutter.

2. A pipe threading machine consisting of a frame,- a pipe holdingspindle supported and rotatably geared in said frame, a headreciprocally supported to move longitudinally of said frame, a portionof said head reciprocally supported to move transversely of said frame,'a cutting off tool frame mounted for movement longitudinally andtransversely of said first-named frame, a circular milling cutterrotatably mounted on said head and a means of rotating said pipe holdingspindle and said circular milling cutter.

3. A pipe threading machine consistin of a frame, a pipe holding spindlesupporte and rotatably geared in said frame, a head reciprocallysupported to move longitudinally of said frame, a portion of said headreciprocally supported to move transeversely of said frame. a cuttingoff tool frame mounted for movement longitudinally and transversely ofsaid first-named frame, a circular milling cutter rotatably mounted onsaid head, a means of rotating said pipe holding spindle and saidcircular milling cutter and an indicator carried by said head toindicate the relative position at which said circular milling cuttershould be positioned when cutting different nominal sizes of pipe.

4. A pipe threading machine consisting of a frame, a pipe holdingspindle supported and rotatably geared in said frame, a headreciprocally supported to move longitudinally of said frame, a portion.of said head reciprocally supported to move transversely of said frame,a cutting off tool frame mounted for movement longitudinally andtransversely of said first-named frame, a circular milling cutterrotatably mounted on said head, a means of rotating said pipe holdingspindle and said circular milling cutter, an indicator carried by saidhead to indicate the relative position at which said circular millingcutter should be positioned when cutting different nominal sizes of pipeand indication marks formed on said indicator corresponding to thenominal sizes of pipe.

5. A pipe threading machine consisting of a frame, a pipe holdingspindle sup ported and rotatably geared in said frame, a headreciprocally supported to move longitudinally of said frame, a portionof said head reciprocally supported to move transversely of said frame,a cutting off tool frame mounted for movement longitudinally andtransversely of said first-named frame, a circular milling cutterrotatably mounted on said head, a means of rotating said pipe holdingspindle and said circular milling cutter, an indicator carried by saidhead to indicate the relative position at which said circular millingcutter should be positioned when cutting different nominal sizes ofpipe, indication marks formed on said indicator corresponding to thenominal sizes of pipe and means whereby a portion. of said indicator maybe movable and adapted to be adjusted to accommodate variations in thediameter of said cutter.

6. A pipe threading machine consisting of a frame, a pipe holdingspindle supported and rotatably geared in said frame. a headreciprocally supported to move longitudinally of said frame, a circularmilling cutter rotatably mounted on said head, a means of rotating saidpipe holding spindle and said circular milling cutter, a cam controllingthe longitudinal reciprocal motion of said head.

7. A pipe threading machine consisting of a frame, a pipe holdingspindle supported and rotatably geared in said frame, a headreciprocally supported to move longitudinally of said frame, a means ofrotating said pipe holding spindle and said circular milling cutter, acam controlling the reciprocal motion of said head, the ratio ofrotation between said cam and said spindle being such that said spindleWill make more than one revolution to one of said cam, thus giving thesaid circular milling cutter the necessary time to advance to the depthof the thread and make one complete revolution of the pipe While at fulldepth and then withdraw.

8. A pipe threading machine consisting of a frame, a pipe holdingspindle supported and rotatably geared in said frame, a headreciprocally supported to move longitudinally of said frame, a portionof said head reciprocally supported to move transversely of said frame,a cam, a toggle mechanism carried by said portion to operate inconjunction with said cam to cause the transverse reciprocal motion tosaid portion at predetermined intervals, a circular milling cutterrotatably mounted on said head, a means of rotating said pipe holdingspindle, said circular mi ling cutter and said cam.

9. A pipe threading machine consisting of a frame, a pipe holdingspindle supported and rotatably geared in said frame, a headreciprocally supported to move longitudinally of said frame, a portionof said head reciprocally supported to move transversely of said frame,a circular milling cutter rotatably mounted on said head, a means ofrotating said pipe holding spindle and said circular milling cutter, acutting off tool frame reciprocally supported to move longitudinally andtransversely of said frame and a cutting off tool carried by saidcutting off tool frame adapted for cutting off lengths of pipe held bysaid pipe holding spindle.

10. A pipe threading machine consisting of a frame, a pipe holdingspindle supported and rotatably geared in said frame, a headreciprocally supported to move longitudinally of said frame, a portionof said head reciprocally supported to move transversely of said frame,a circular milling cutter rotatably mounted on said head, a means ofrotating said pipe holding spindle and said tool frame reciprocallysupported to move longitudinally of said frame and transvers cutting offlengths of pipe held by said pipe holding spindle and a graduatedindicator thereon referring to the different nominal sizes of pipewhereby said cutting off tool frame may be properly adjusted in relationto the position of said circular milling cute ter.

11. A pipe threading machine consisting of a frame, a pipe holdingspindle supported and rotatably geared in said frame, a headreciprocally supported to move loncircular milling cutter, a cutting offlji) ' of rotating said pipe ting off ed and rotatably gearedgitudinally of said frame, a portion of said head reciprocally supportedto move transversely of said frame, a circular milling cutter rotatab-lymounted on said head. a means holding spindle and said circular millingcutter, a cutting off tool frame reciprocally supported to movelongitudinally and transversely of said frame, a cutting off toolcarried by said cuttool frame adapted for cutting off lengths of pipeheld by said pipe holding s indle and a burr cutting member carried bysaid cutting off tool frame.

12. A pipe threading machine consisting of a frame, a pipe holdingspindle support ed and rotatably geared in said frame, a headreciprocally supported to move longitudinally of said frame, a portionof said head reciprocally supported to move transversely of said frame,a circular milling cutter rotatably mounted on said head, a means ofrotating said pipe holding spindle and Said circular milling cutter, acutting off tool frame reciprocally supported to move longitudinally andtransversely of said frame, a cutting off tool carried by said cuttingoff tool frame adapted for cutting off lengths of pipe held by said pipeholdin spindle and a burr cutting member carrie by said cutting off toolframe, said burr cutting member disposed angularly and reciprocally inlast said frame.

13. A pipe threading machine consisting of a frame, a pipe holdingspindle sup ported and rotatably geared in said frame, a headreciprocally supported to move longitudinally of said frame, a portionof said head reciprocally supported to move transversely of said frame.a circular milling cutter rotatably mounted on said head, a means ofrotating said pipe holding spindle and said circular milling cutter, acutting off tool frame reciprocally supported to move longitudinally ofsaid frame and transversely of said frame, a cutting off tool carried bysaid cutting ofi tool frame mounted for longitudinal and transversemovement adapted for cutting off lengths of pipe held by said pipeholding spindle and a burring tool disposed angularly in the last-namedframe and adapted for removing a burr from the said pipe.

14-. A pipe threading machine consisting of a frame, a pipe holdingspindle supportin said frame, a circular milling cutter rotatablymounted and supported from said frame to be reciprocated thereon, ameans of rotating said circular milling cutter, a cutting off toolreciprocally mounted on said frame mounted for longitudinal andtransverse movement,

a means for rotating said pipe holding spindle at various predeterminedrates of speed from a fixed speed drive shaft.

15. A pipe threading machine consisting of a frame, a pipe holdingspindle support ed and rotatably geared on said frame, a circularmilling cutter rotatably and reeip rocally supported on said frame, ameans of rotating said circular milling cutter at a fixed rate of speed,a set of high and low ratio gearing introduced intermediate the point ofapplication of power and the said pipe holding spindle, mechanismadapted to either the high or low ratio gearing, whereby a high speed onthe said pipe holding spindle is obtained for cutting off and low speedon the said pipe holding spindle for threading. 7

v 16. A pipe threading machine consisting of a frame, a ipe holdingspindle supported and rotata ly geared in said frame, a headreciprocally supported to move longitudinally of said frame, a portionof said head reciprocally supported to move transversely of said frame,a circular milling cutter rotatably mounted on said head, means ofrotating said circular milling cutter at a fixed rate of speed, a set ofhigh and low ratio gearing introduced intermediate the pointofapplication of power and the said pipe holding spindle, mechanismadapted to the high or low ratio gearing and a locking mechanism wherebysaid head cannot be reciprocated on the said frame when said high ratiogearing is in operation.

17. A pipe threading machine consisting of a frame, a pipe holdingspindle supported and rotatably geared in said frame, a headreciprocally supported to move longitudinally of said frame, a portionof said head reciprocally supported to move transversely of said frame,a circular milling cutter rotatably mounted on said head, means ofrotating said circular milling cutter at a fixed rate of speed, a set ofhigh and low ratio gearing introduced intermediate the point ofapplication of power and the said pipe holding spindle, mechanismadapted to the high or low ratio gearing and a locking mechanism wherebysaid high ratio gearing cannot be put into operation while said head isreciprocally moved into operative threading position.

18. A pipe threading machine consisting of a frame, a pipe holdingspindle supported and rotatably geared in said frame, a circular millingcutter rotatably and reciprocally supported on said frame, a means ofrotating said circular milling cutter at a fixed rate of speed, a set ofgears suitably supported and operated in conjunction with last saidmeans, gear movers for adjusting the relative position of said gears,handles operating said gear movers, indication marks in the path ofmovement of said handles so that said handles may be positioned atcertain points to operate certain of said gears at a predetermined rateof speed, ac-

cording to the size of the pipe in said pipe

